Will 1996 Chevy blazer fenders interchange with 2001 sonoma?

No, 1996 Chevy Blazer fenders will not interchange with 2001 Sonoma fenders. While both are GM vehicles and share some platform similarities, the body styles are different enough that the fenders are not compatible. The Blazer is a SUV and the Sonoma is a compact pickup truck. Even within the same model year, Blazer and Sonoma fenders wouldn't interchange.